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From: jack@cwi.nl (Jack Jansen)
Newsgroups: comp.sys.dec,comp.sys.sgi,comp.sys.mips
Subject: R2010 problems while porting an OS to the R2000
Message-ID: <2628@charon.cwi.nl>
Date: 29 Nov 90 13:09:08 GMT
Sender: news@cwi.nl
Followup-To: comp.sys.dec
Organization: AMOEBA project, CWI, Amsterdam
Lines: 20

I'm currently porting Amoeba, our distributed OS, to the R[23]000.
Currently, I'm using the DEC3100 and the SGI 3D/25 as the first
machines to port to.

Everything runs fine, with one exception: the floating point unit.

I keep getting 'Unimplemented Operation' traps at quite unexpected
times. After looking at the Ultrix sources I'm getting the impression
that the kernel should be ready to execute any FP op, not just the
unimplemented ones like sine or sqrt. Is this correct?

If so, is there some document that tells me when the FPU fails, and
what I can do about it? Or, even better, would someone happen to
have one lying around? I'm not really thrilled by the idea of having
to implement a full fp emulator....
--
--
Een volk dat voor tirannen zwicht	| Oral:     Jack Jansen
zal meer dan lijf en goed verliezen	| Internet: jack@cwi.nl
dan dooft het licht			| Uucp:     hp4nl!cwi.nl!jack